Valve are saying "to hell with third party Steam sales" this weekend, as their digital download store plays host to an in-house firesale, with Half-Life, Counter-Strike and Team Fortress products all going for a song.

All standalone Half-Life titles (including Team Fortress Classic) are a whopping 66% off, meaning you can buy all seven of them for just $17. Or, if you want to be selective, Half-Life will cost you $3.40, Half-Life 2, $6.80.